For my new home I have installed a powerful rangehood with maximum Airflow 1860m³/hr and flue outdoor.
When I turned on the first time I feel that it is not powerful enough, then I tried to disconnect the duct exiting the rangehood above and the rangehood instantly becomes very powerful, of course as there are no airflow restrictions.
Then I climbed up the attic and check the plumbing, the diameter of the duct is only 125mm and using a flexible duct, and exiting through the eaves the duct needs to do a U-turn, and the small eaves vent with the insect grille impedes much of the airflow.
So any suggestion to improve the performance?
I am thinking to connect a Y connector and split the duct and install one more eaves vent to have two exit points does that work?